Matrix molding machine



May 9, 1939. H, N RHAM 2,157,327

MATRIX MOLDING MACHINE Filed March 9, 1 936 the production Patented May 9, 1939 uui'rao STATES PATENT orrica MATRIX MOLDING MACHINE Hobart N. Durham,

Manhasset, N. Y., assignor to The Goss Printing Press 111., a corporation of Illinoi Company, Chicago, 5

Application March 9,1936, Serial No. 67,810 4 Claims. (Cl. 60---52) e present invention 'relates to matrix molding presses and more particularly to a hydraulically operated matrix press for the production of Objects and advantages of particularly suited stereotype matrices.

the invention will be set forth in part hereinafter and in part will be obvious herefrom,

tice with the invention; the

or may be learned by pracsame being realized and attained by means of the instrumentalities and combinations claims. 4

The invention cons structions, arrangements, provements herein shown The accompanying pointed out in the appended ists in the novel parts, concombinations and'imand described.

drawing, referred to herein and constituting a part hereof, illustrates one the. v of the invention;

The single figure illustrative embodiment of serves to explain the principles I of the'drawing shows an the invention and is largely diagrammatic.

The present invention has for its object the provision of a novel and improved hydraulic matrix molding press. vention is the provis A further object of th'efinion of a molding press for 'of stereotype matrices, which press does not'require constantfattention on the part of the operator of matrices of other object of the inventiona hydraulic matrix molding aullc pressure duced centrifugally.

Referring tome illustrative embodiment of and insures the production press-in which the for operating the press is prothe invention, there is provided a'hydraulic matrix molding press, a motor' pump for supplying driven centrifugal liquid to said press at the for starting, stopping requisite high pressure, and motor ontrol means and'controlli g the speed of the motor so as t hydraulic press. controlling the flow pump and press and interconnected with the motor govern the a of liquid to and from the these means are preferably control means so that only a single control need be operated by the operator.

The motor speed control means are preferably automatically controlled by means of the pressure so that a predetermined pressure is exerted on the fiong by the s reduced and reduced value so longas is the pressure complete molding of It will be understo eral description and press, after which maintained at its necessary for the \the matrix.

od that the foregoing genthe following detailed debodiment of the the motor 22 so as to reduce tion of the Means are also provided for scription as well are exemplary and explanatory of the invention but are not restrictive thereof.

Referring now in detail to the illustrative eminvention, there is provided a molding press which comprises stationary or upper platen ll hydraulic matrix the frame 10, a

3 which extends into the presformed as a part of the lower ID. A liquid passageway l5 also extends through the frame and connects alternatively with the sump I or high pressure centrifugal the three-way valve 20.

' rapidly creating the predeterpressure compnises'gia multi-stage pump I! through The means for mined high motor- 22 and by regulating the! speed drives the pump,

of the motor substantially any desired, liquid pressure may be produced. 25 Povvgn is supplied to motor 22 from mains 25 and! through switch 21 which is mechanically interconnected with valve 20 so that with the valve in draining position, the switch is opened to stop the pump, while with the valve in operatlug position, the motor is supplied with power.

motor, thereby reducing the pressure developed by the pump ll, but maintaining suillcient pressure tclhold the platens H and I! in matrix drying position. Automatic means may be provided for automatically reducing the pressure 4 with a variably positionable contact 33 closing a circuit when the maximum desired pressure has been attained within the chamber. A polarized relay 35 is provided which is alternatively adapted to place the resistance 30in series with the motor windings or to connect the motor directly to the supply mains. The variably positionable contact I2 adapted to place one of the coils of the polarized relay 3! in circuit and thereby place the resistance 80 in the motor circuit, while another contact 51 is provided on the main switch and is closed during movement of the valve 20 from one of its positions to another to bodiment are illustratively shown connected as follows:

One of the mains 25 is directly connected to the motor, whilethe other main 26 is also connected to the motor 22 through contact segment 4|, switch bar 42, contact 42, armature 44, contact 45 or alternative contact 48 and resistance 30.

The magnet 50 of polarized relay 35 is connected to mains 25 and 28 through contact segment 4|, bar 42, contact 43, pressure operated contact bar SI and variably positionable contact 33'.

The magnet 55 of polarized relay 35 is connected to mains 25 and 26 through contact segment 4|, switch bar 42, and contact 51, so that as valve 20 is moved from open to closed position, or vice versa, contact 51 is placed in circuit to energize magnet 55 and reset the polarized relay to high speed position.

In the operation of the illustrative embodiment, the operator positions the form 60 on the movable platen i2, places the flong 6| over it together with the necessary blankets 62, and moves v the switch and valve controlling lever to full pressure position. This movement of the valve, first closes the circuit through contact 51 to energize the windings of magnet 55 and positions the armature 44 in high speed position. Upon completion of the valve movement, power is supplied to the motor 22 through contacts 45 and 42, starting the motor 22 and supplying liquid under pressure to the pressure chamber H to move platen l2 upwardly and force the flong 6| into the depressions of the form 60.

The discharge of liquid from the centrifugal pump is minishing as the resistance to this flow is increased and finally ceasing when the pressure exerted between the platens balances the pressure created by the pump. Thus, the platen l2 moves rapidly at first until pressure is exerted on the flong and form and then the flow is gradually diminished, slowly pressing the flong into the form and stopping when the pressure exerted on the flong balances the maximum pressure which can be created by the pump at the speed at which it is operated.

The maximum pressure to be developed by the pump and thereby the maximum pressure to be developed between the platens ii and I2 is variably limited, and for this purpose the pressure indicator 32 is provided with a variably positionable contact 22 which automatically reduces the motor speed when the maximum desired pressure has been attained. This reduced motor speed is suiilcient to hold the flong against shrinkage during drying, but is not suflicient to prevent rapid drying in the usual manner. Upon contact of indicator arm SI with contact 33, current is supplied to the windings of magnet 80 throwing armature 44 into contact with contact 46 and thereby placing the resistance 30 in series with the motor windings. As the pressure created by the pump n is plunger for extremely rapid at first, gradually dination relatively movable plate substantially proportional to the square of the speed of motor 22, only a small reduction in motor speed is necessary to effect a relatively large reduction in maximum pressure between the platens Ii and i2.

After the flong has dried sufficiently, the valve 20 is restored to its draining position, as shown, resetting. the armature 44 by energization of magnet 55; and the liquid drains from the pressure chamber l4 into the sump l8, allowing the platen l2 to descend and thereby permitting easy removal of the matrix and form.

The invention in its broader aspects is not limited to the specific mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without sacrificing its chief advantages.

What I claim is:

1. A matrix molding press including in combination relatively movable platens, a hydraulic moving one of the platens, a highpressure centrifugal pump for supplying liquid to said plunger, means for driving said pump at a plurality of different speeds, a polarized relay for controlling the driving speed, and means operated by the pump pressure I controlling said relay to reduce the motor spec and pump pressure after a maximum pressure has been reached.

2. A matrix molding press including in combination relatively movable platens, a hydraulic plunger for moving one of the platens, a highpressure centrifugal pump for supplying liquid to said plunger, motor means for driving said pump at a plurality of different speeds, a polarized relay forcontrolling the motor speed and means operated by a variably predetermined pump pressure for controlling said relay to reduce the motor speed when the pressure has attained a predetermined maximum whereby the liquid supplied to the plunger by the pump is at a lower than maximum pressure.

3. A matrix molding press including in combination relatively movable platens, a cylinder in which is a hydraulic plunger for moving one of the platens, a high-pressure centrifugal pump for supplying liquid to said plunger, motor means ion driving said pump at a plurality of difierent speeds, 'a relay for controlling the motor speed, means operated by the pressure applied to the plunger for actuating said relay to reduce motor speed, a drain valve for draining the cylinder, a motor switch through which power is supplied to the pump motor and a common means for opening said valve and switch and for closing said valve and switch.

4. A matrix molding press including in combia cylinder in which is a hydraulic plunger for moving one of the platens, a high-pressure centrifugal pump for supplying liquid to said plunger, motor means for driving said pump at a plurality of different speeds, a relay for controlling the motor speed, means operated by the pressure applied to the plunger for actuating said relay to reduce motor speed, adrain valve for draining the cylinder, a motor switch through which power is supplied to the pump motor and a common means for opening said valve and switch and for closing said valve and switch, said switch also serving to reset said relay to its normal high-speed position.

HOBART N. DURHAM. 

